ATLAS PL Personal Locator Battery Performance
The ATLAS PL Personal GPS Locator operates off of two internal Lithium-Ion battery packs. Combined, the two batteries deliver 6.8 – 8.6V to the internal radio circuitry. As the ATLAS PL is used, the batteries discharge, the battery voltage drops, and the RF power will slightly decrease.
Below is a table showing typical RF power output verses battery life.
| Time (Hrs) | Cell Voltage | Pack Voltage | % Battery Remaining | RF Power Output | TX Current | |
| 0 | 4.30 | 8.60 | 100% | 5.0 | ||
| 1 | 4.10 | 8.20 | 92% | 4.7 | 2.9 | |
| 2 | 4.00 | 8.00 | 83% | 4.6 | ||
| 3 | 3.90 | 7.80 | 75% | 4.4 | ||
| 4 | 3.85 | 7.70 | 67% | 4.4 | ||
| 5 | 3.82 | 7.64 | 58% | 4.3 | ||
| 6 | 3.80 | 7.60 | 50% | 4.3 | ||
| 7 | 3.75 | 7.50 | 42% | 4.2 | ||
| 8 | 3.70 | 7.40 | 33% | 4.2 | ||
| 9 | 3.68 | 7.36 | 25% | 4.1 | ||
| 10 | 3.65 | 7.30 | 17% | 4.1 | ||
| 11 | 3.50 | 7.00 | 8% | 3.9 | 2.8 | |
| 12 | 3.40 | 6.80 | 0% | 3.7 |
The above data is represented graphically in the following chart:
The time duration that the ATLAS PL will operate before its batteries must be recharged is dependent upon the GPS mode and the position transmission/update rate.
Below is a chart showing approximate battery life. The Green line is if the PL is operating in GPS mode 2, 4, or 9 with the UHF radio receive enabled. The Blue line is GPS mode 9 with the receive disabled (Transmits position only).
